Load, Change & Play Sound in BGE Without using Logic Bricks
All you need it to load a script file using an Always Sensor and a Python Controller. In the script file put:

import aud
device = aud.device()
sound = aud.Factory.file("sound.ogg")
sound = sound.pitch(2)
device.play(sound)


This will load the file, pitch-shift it and play it back.